Move plugins to manifest, pin Docker version, add Makefile

- Add plugins.txt listing all plugins for reproducible installs
- Add Makefile with setup/start/stop/install-plugins targets
- Remove user/plugins/ from git tracking
- Pin Docker image to 1.7.49.5-ls244

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/admin/themes/grav/templates/partials/blueprints-raw.html.twig

@@ -1,22 +0,0 @@
-{% set form_id = form_id ? form_id : 'blueprints' %}
-{% set scope = scope ?: 'data.' %}
-{% set field_layout = 'admin' %}
-
-{% if admin.findFormFields('file', blueprints.fields) %}
-    {% set multipart = ' enctype="multipart/form-data"' %}
-{% endif %}
-
-<form {% if form_action %}action="{{ form_action }}"{% endif %} id="{{ form_id }}" method="post" data-grav-form="{{ form_id }}" data-grav-keepalive="true"{{ multipart|raw }}>
-    {% embed 'forms/default/fields.html.twig' with {name: null, fields: blueprints.fields} %}
-        {% block inner_markup_field_open %}<div class="block block-{{ field.type }}">{% endblock %}
-        {% block inner_markup_field_close %}</div>{% endblock %}
-    {% endembed %}
-
-    {% if form %}
-        {% include "forms/fields/formname/formname.html.twig" %}
-        {% include 'forms/fields/uniqueid/uniqueid.html.twig' %}
-        {{ nonce_field(form.getNonceAction(), form.getNonceName())|raw }}
-    {% else %}
-        {{ nonce_field('admin-form', 'admin-nonce')|raw }}
-    {% endif %}
-</form>